<h2>Plan view:</h2>
Enter Y for center point.
Range is 0.0 to 1.0, 0.5 is normal.

<h2>Cross-section:</h2>
Enter Y for waypoint (0.0 <= y < 1.0) OR 
J for waypoint in gridpoints (e.g. 50).
<p>
For longitude append with the letter "l" (e.g. -105.0l)

<h2>Sounding or All-Sky:</h2>
Enter J for sounding location in gridpoints (e.g. 50)
<p>
For longitude append with the letter "l" (e.g. -105.0l)
